Clean the dataframe

Note the issues that need to be fixed $($removing columns, removing rows, changing column names$).$

Within your function, make sure there are $51$ rows $($one per state $+$ the district of Columbia$).$

Make sure there are only $5$ columns with the columns having the following names $($stateName$,$ Census, Estimates, Pop$2010,$ Pop$2011).$

Make sure the last four columns are numbers $($i$.$e$.$ not strings$).$