Changed methods to use strings instead of char*

include/eal.h

-#ifndef EAL_H
-#define EAL_H
+#ifndef EAL_INCLUDE_EAL_H
+#define EAL_INCLUDE_EAL_H
 
 #include <vector>
-#include <string.h>
+#include <string>
 
 using namespace std;
 
-vector<double> getPosition(vector<vector<double>> coords, vector<double> coeffs, char *interp, double time);
-vector<double> getVelocity(vector<vector<double>> coords, vector<double> coeffs, char *interp, double time, bool interpolation);
+namespace eal {
 
-vector<double> getPosition(vector<double> coeffs, char *interp, double time);
-vector<double> getVelocity(vector<double> coeffs, char *interp, double time, bool interpolation);
+  vector<double> getPosition(vector<vector<double>> coords, vector<double> times, string interp, double time);
+  vector<double> getVelocity(vector<vector<double>> coords, vector<double> times, string interp, double time, bool interpolation);
 
-vector<double> getRotation(char *from, char *to, vector<vector<double>> rotations, vector<double> times, char *interp, double time);
-vector<double> getAngularVelocity(char *from, char *to, vector<vector<double>> rotations, vector<double> times, char *interp, double time);
+  vector<double> getPosition(vector<double> coeffs, string interp, double time);
+  vector<double> getVelocity(vector<double> coeffs, string interp, double time, bool interpolation);
 
-vector<double> getRotation(char *from, char *to, vector<double> coefficients, char *interp, double time);
-vector<double> getAngularVelocity(char *from, char *to, vector<double> coefficients, char *interp, double time);
+  vector<double> getRotation(string from, string to, vector<vector<double>> rotations, vector<double> times, string interp, double time);
+  vector<double> getAngularVelocity(string from, string to, vector<vector<double>> rotations, vector<double> times, string interp, double time);
+
+  vector<double> getRotation(string from, string to, vector<double> coefficients, string interp, double time);
+  vector<double> getAngularVelocity(string from, string to, vector<double> coefficients, string interp, double time);
+
+}
 
 #endif // EAL_H

src/eal.cpp

 #include "eal.h"
 
+using namespace eal;
+
 // Positional Functions
 
 // Position Data Functions
-vector<double> getPosition(vector<vector<double>> coords, vector<double> coeffs, char *interp, double time) {
+vector<double> getPosition(vector<vector<double>> coords, vector<double> times, string interp, double time) {
   vector<double> coordinate = {0.0, 0.0, 0.0};
   return coordinate;
 }
 
-vector<double> getVelocity(vector<vector<double>> coords, vector<double> coeffs, char *interp, double time, bool interpolation) {
+vector<double> getVelocity(vector<vector<double>> coords, vector<double> times, string interp, double time, bool interpolation) {
   vector<double> coordinate = {0.0, 0.0, 0.0};
   return coordinate;
 }
 
 // Postion Function Functions
-vector<double> getPosition(vector<double> coeffs, char *interp, double time) {
+vector<double> getPosition(vector<double> coeffs, string interp, double time) {
   vector<double> coordinate = {0.0, 0.0, 0.0};
   return coordinate;
 }
 
-vector<double> getVelocity(vector<double> coeffs, char *interp, double time, bool interpolation) {
+vector<double> getVelocity(vector<double> coeffs, string interp, double time, bool interpolation) {
   vector<double> coordinate = {0.0, 0.0, 0.0};
   return coordinate;
 }
@@ -27,23 +29,23 @@ vector<double> getVelocity(vector<double> coeffs, char *interp, double time, boo
 // Rotation Data Functions
 
 // Rotation Data Functions
-vector<double> getRotation(char *from, char *to, vector<vector<double>> rotations, vector<double> times, char *interp, double time) {
+vector<double> getRotation(string from, string to, vector<vector<double>> rotations, vector<double> times, string interp, double time) {
   vector<double> coordinate = {0.0, 0.0, 0.0};
   return coordinate;
 }
 
-vector<double> getAngularVelocity(char *from, char *to, vector<vector<double>> rotations, vector<double> times, char *interp, double time) {
+vector<double> getAngularVelocity(string from, string to, vector<vector<double>> rotations, vector<double> times, string interp, double time) {
   vector<double> coordinate = {0.0, 0.0, 0.0};
   return coordinate;
 }
 
 // Rotation Function Functions
-vector<double> getRotation(char *from, char *to, vector<double> coefficients, char *interp, double time) {
+vector<double> getRotation(string from, string to, vector<double> coefficients, string interp, double time) {
   vector<double> coordinate = {0.0, 0.0, 0.0};
   return coordinate;
 }
 
-vector<double> getAngularVelocity(char *from, char *to, vector<double> coefficients, char *interp, double time) {
+vector<double> getAngularVelocity(string from, string to, vector<double> coefficients, string interp, double time) {
   vector<double> coordinate = {0.0, 0.0, 0.0};
   return coordinate;
 }