During Problem Set i came across the error Expected Expression on the statement "string s = GetString();" Suggestions would be appreciated. The code is provided below.

#include <cs50.h> #include <stdio.h> #include <string.h>

int main(void) { int s = 0; // Height int t = 0; // Line int u = 0; // Column

do
{
    // Gathers string.
    printf("Please provide the height of the pyramid: ");
    string s = GetString();
}
while (s < 1 || s > 23);

// Selects a line.
for (int t = 1; t <= s; t++)
{
    // Selects a column.    
    for (int u = 1; u <= s; u++) 
    {
    // Prints character.
    if (u >= s + 1 - t)
    {
        printf("#");
    }
    else
    {
        printf(" ");
    }
    }
}
// Prints next line.
printf("\n");

}