我的数据框如下：
name comment
Bill Bill is great
Bill Bill is bad
Bill Who is Bill?
Jane Jane is okay
Jane Jane is good
Jane Jane's the best
我想重塑我的数据框，使其看起来像这样：
name comment1 comment2 comment3
Bill Bill is great Bill is bad Who is Bill?
Jane Jane is okay Jane is good Jane's the best
我认为使用group_by函数可以完成此操作，但是我没有运气。
数据，格式为dput。
df1 <-
structure(list(name = c("Bill", "Bill", "Bill", "Jane", "Jane",
"Jane"), comment = c("Bill is great", "Bill is bad", "Who is Bill?",
"Jane is okay", "Jane is good", "Jane's the best")), row.names = c(NA,
-6L), class = "data.frame")