C program has memory leak

I have made a function in C called strremovestr to remove substring from string, but there's a memory leak.

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
char* strremovestr(const char* data,const char* what){
    const int ws = strlen(what);
    const int ds = strlen(data);
    size_t currsize = ds;
    char* newdata=(char*)malloc(currsize+1);
    strcpy(newdata, data);
    newdata[currsize] = '\0';
    const char* hehe = NULL;
    while((hehe=strstr(newdata, what))){
        size_t detent = hehe - newdata;
        memmove(newdata+detent, ewdata + detent + ws,currsize - detent - ws+ 1);
        currsize-=ws;
    }
    newdata=realloc(newdata,currsize + 1);
    newdata[currsize] = '\0';
    return newdata;
}
int main(){
    printf("%s\n",strremovestr("hello", "e"));
    return 0;
}

Now this is reproducible example, you can run with valgrind to confirm that it has memory leak. I had to add spacing between things in this code to make it more easier to read :)

Where's the memory leak here? Thanks for reading.

Solution

You allocate the memory

char* newdata=(char*)malloc(currsize+1);

but you never free it.

int main()
{
    char *str;
    printf("%s\n",(str = strremovestr("hello", "e")));
    free(str);
}

also:

strlen returns size_t not int
do not cast the result of malloc
store result of the realloc in temporary pointer. Otherwise if realloc fails, you will have another memory leak.
check the result of memory allocation functions.
newdata[currsize] = '\0'; strcpy copies null terminating character too. It is not needed