delete_char.cpp

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <iostream>

using namespace std;

char * remove_char_from_string(char *input_string, char given_char) {
    
    char * newstring = (char *) calloc(strlen(input_string) + 1, sizeof(char));
    strcpy(newstring, input_string);

    // pointer to character to be overwritten
    char * p;
    while(p = strchr(newstring, given_char)) {
        strcpy(p, p+1);
    }

    // null terminate string
    newstring[strlen(input_string)] = '\0';
 
    return newstring;
}

int main() {
    char str1[] = "shamalamadingdong";
    cout << remove_char_from_string(str1, 'm') << endl;
}