the idea is that i type in a sentence and store it as a string... then i can choose a letter and change it to a different letter

```
int main(int argc, char *argv[])
{

    char string[100];
    char newLetter;
    char oldLetter;
    int i = 0;

    printf("Please enter your sentence : ");
    gets(string);

    printf("\n\nWord is : %s" , string );

    printf("\n\nTarget : ");
    scanf("%s", &oldLetter);
    printf("Replace with : ");
    scanf("%s", &newLetter);

    for ( i = 0; i < sizeof(string); i++) 
    { 
        if (string[i] == oldLetter)
        { 
            string[i] = newLetter; 
            break;
        } 
    }
    printf("\n\nWord is : %s" , string );

    system("PAUSE");   
    return 0;
}

```

any help in where I've gone wrong is appreciated 

eg.
input could be - yellow lorry red lorry

then target - r

change to - t

output - yellow lotty ted lotty