The problem PR links solves

PR1 : https://github.com/WikiPortal/DoodleCollab/pull/67
PR2 : https://github.com/WikiPortal/DoodleCollab/pull/73
PR3 : https://github.com/WikiPortal/DoodleCollab/pull/121
PR4 : https://github.com/WikiPortal/DoodleCollab/pull/152
PR5 : https://github.com/WikiPortal/DoodleCollab/pull/158

Challenges I ran into

N/A