I am trying to replace a string in a function with double pointers. I would like to see this change back in main. What am I doing wrong?

These are the warnings my compiler gave me.

$ gcc *.c -Wall
main.c: In function ‘replacevalue’:
main.c:10:12: warning: passing argument 1 of ‘strcpy’ makes pointer from integer without a cast [-Wint-conversion]
     strcpy(**pinput1, string);
            ^
In file included from main.c:4:0:
/usr/include/string.h:38:8: note: expected ‘char * restrict’ but argument is of type ‘char’
 char  *strcpy (char *__restrict, const char *__restrict);
        ^~~~~~

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

void replacevalue(char **pinput1)
{
    char string[] = "here is the replacement string";
    strcpy(**pinput1, string);
}

void stringtest(char *pinput1)
{
    replacevalue(&pinput1);
}

int main()
{
    char string[] = "here is a string                          ";
    char *pinput1 = string;
    printf("%s \n", pinput1);
    stringtest(pinput1);
    printf("%s \n", pinput1);

    return 0;
}//end main