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Update double quotes
Revert "Attempt to organize wiki into file structure" This reverts commit b53dd7f61a13f715c946e79344324902b723415c.
Attempt to organize wiki into file structure
Revert f8983311190a589679a69cd3fd125092060f9b2e...fb844a5c58f31ffb1fb38b41f15236f2c1df0f13 on Substring
Update Solutions and Add Java
Delete Excess top line
Add Time Estimate
Add link, problem difficulty, similar topics and questions
Updated Substring (markdown)
Created Substring (markdown)