1. Data Cleaning: https://www.dropbox.com/scl/fi/trgqxp1elg7gvd89ct4d3/Data_Cleaning.Rmd?rlkey=oy0e9xmyqnuzic1kod5b5lk6h&dl=0
2. tidyr package: https://www.dropbox.com/scl/fi/af3w1wcxkeqp56s46a3gx/tidyr_package.Rmd?rlkey=tawzxek7qhul3lg0u6lrmji84&dl=0