How to fix a parser core dump problem

  1  #include <iostream>
  2  #include <list>
  3  #include <string>
  4  #include <algorithm>
  5  #include <bits/stdc++.h>
  6  
  7  
  8  using namespace std;
  9  
 10  
 11  
 12  string input;
 13  string output = " ";
 14  char* commandI;
 15  bool nounCheck2;
 16  bool verbCheck2;
 17  
 18  string parseCommand(char commandp[2]) {
 19      size_t noun;
 20      size_t verb;
 21      list<string> verbs = {"take", "drop"};
 22      list<string> nouns = {"sword", "shield"};
 23      
 24      verb = commandp[0];
 25      noun = commandp[1];
 26      
 27      size_t verbCheck (verb);
 28      if(verbCheck == string::npos) {
 29          cout << "invaild verb" << "\n";
 30      } else {
 31          verbCheck2 = true;
 32      };
 33      size_t nounCheck (noun);
 34      if (nounCheck == string::npos) {
 35          cout << "invaild noun" << "\n";
 36      } else {
 37          nounCheck2 = true;
 38      };
 39      
 40  };
 41  
 42  string parseString(string fInput) {
 43      char delims[2] = {" "}; {".";};
 44      char arr[fInput.length()]; 
 45  	strcpy(arr, fInput.c_str()); 
 46  	for (int i = 0; i < fInput.length(); i++) {
 47  		cout << arr[i]; 
 48  	}
 49      commandI = strtok(arr, delims);
 50      while (commandI != NULL) {
 51          parseCommand(commandI);
 52          if (verbCheck2 && nounCheck2) {
 53              cout << "command vaild" << "\n";
 54          }
 55          commandI = strtok(NULL, delims);
 56      }
 57      return 0;
 58  };  
 59  
 60  int main()
 61  {
 62      do{
 63          getline(cin, input);
 64          parseString(input);
 65  
 66      }while (input != "quit");
 67  
 68      return 0;
 69  }

main.cpp: In function ‘std::string parseCommand(char*)’:
main.cpp:40:1: warning: no return statement in function returning non-void [-Wreturn-type]
   40 | };
      | ^
take sword
Segmentation fault (core dumped)