Need Help ASAP with C function (can use helper functions)

Trying to figure out a C function that can identify and replace clumps in a 2-D Array.

For Example, identify the different clumps of 1s in this picture:

And replace them with numbers (doesn't matter which numbers), like this:

0 0 1 1 0 0 1 0 0 1 1 0 1 1 0 0 1 1 0 1 1 0 0 1 1 0 1 1 0 1 1 1 0 0 0 0 0 0 0 0 1 0 0 1 1 1 0 0 1 0 0 0 0 0 1 0 0 1 1 0 0 0 1 0 0 1 0 1 0 0 0 0 1 1 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 1 0 1 1 0 0 0 1 1 1 1 0 0 2 2 4 1 0 2 2 0 0 3 3 0 4 1 0 0 2 2 0 3 3 0 4 1 1 oooooooo 1 0 0 5 5 5 0 0 5 0 o o o o 5 o o 5 5 0 0 0 6 0 0 5 0 5 0 0 oo6 6 o o 5 o oooooo77 0 6 6 0 0 0 7 7 7 7