Brachylog, 5 bytes (Non-competing)

@[@w\

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Explanation

@[       Take a prefix of the input
  @w     Write this prefix to STDOUT followed by a linebreak
    \    False: try another prefix

Right-to-left strings seem to work properly, even though I never even considered them.

Brachylog, 5 bytes

@[@w\

Try it online!

Explanation

@[       Take a prefix of the input
  @w     Write this prefix to STDOUT followed by a linebreak
    \    False: try another prefix

Right-to-left strings seem to work properly, even though I never even considered them.

Brachylog, 5 bytes (Non-competing)

@[@w\

Try it online!

###Explanation

@[       Take a prefix of the input
  @w     Write this prefix to STDOUT followed by a linebreak
    \    False: try another prefix

Right-to-left strings seem to work properly, even though I never even considered them.

Brachylog, 5 bytes (Non-competing)

@[@w\

Try it online!

Explanation

@[       Take a prefix of the input
  @w     Write this prefix to STDOUT followed by a linebreak
    \    False: try another prefix

Right-to-left strings seem to work properly, even though I never even considered them.